Fountain pen



FIG. 1 is a front elevational view of a fountain pen showing my new design;

FIG. 2 is a right side elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a front elevational view with the cap deposed on the end remote from the nib;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a top plan view of FIG. 2;

FIG. 8 is a bottom plan view of FIG. 3; and

FIG. 9 is a perspective view of FIG. 5. 

The ornamental design for a fountain pen, substantially as shown and described. 